ok just recorded a sample recording with my setup.. not the orchestra type sound, but still having string-like sounds, complete with echoes and stuff. Pardon the horrible quality in playback; i'm using a computer mic in front of my amp to capture this.
http://www.rayrose.qsurf.org/hitomi_no_jyunin.mp3
yep, if anyone is wondering, that's the guitar part to the l'arc en ciel song. which was incidentally horribly covered by sylvester sim. (even the guitar parts on his version was friggin bad.)
anyway, back to topic, this is a combination of chorus, delay and volume swelling with my guitar volume knob. no picking is required; strings are devoid of pick attacks and we want to minimize that as much as possible. simply slide the string with your fingering hand on the frets and try to capture the feel of the song as much with your volume knob (the volume acts as your dynamics.)
sample settings i'm using:
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washburn guitar with PAF Pro on neck -> Moderate distortion for rock sound -> Boss DD3 -> Boss CH1 -> Amp
Boss DD3: Level 2 oclock, Feedback 10 oclock, Delay Time 12 oclock, ~500ms.
Boss CH1: : Level 10 oclock EQ, Rate, Depth 2 oclock.
Lastly, I'm not sure if using an analog delay can achieve the effect. You could try if you own one.